Great Northern Railway Historical Society Blueprint Collection JSBP0743, Butte, Montana, undated. Great Northern Blueprint Number 04.08.10, Interlocking. Track Plan. Authorization for Expenditure 5098. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Interlocking.
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LC Name Authority: https://lccn.loc.gov/n81068043